//		/abc or /abd/a are not descendants of /ab.
func (cp collectorPath) isDescendantOf(arg string) bool {
	descendant := string(cp)
	if descendant == arg {
		return true
	}
	if len(arg) >= len(descendant) {
		return false
	}
	if !strings.HasSuffix(arg, "/") {
		arg += "/"
	}
	return strings.HasPrefix(descendant, arg)
}

// MetricType - represents the type of a metric.
type MetricType int

const (